* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: Helvetica, "PingFang SC", "Microsoft Yahei", sans-serif;
}

main {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100vh;
  background-color: #1e272e;
}

/* 选择器容器 */
.slider {
  width: 50%;
  display: flex;
  align-items: center;
}

input[type="range"] {
  /* 禁用浏览器默认外观 */
  -webkit-appearance: none;
  background: linear-gradient(75deg, #3c40c6 0%, #575fcf 100%);
  border-radius: 4px;
  width: 100%;
  height: 12px;
  outline: none;
  box-shadow: 0 0 6px rgb(28, 32, 148);
}

/* 滑动选择器上的滑动按钮 */
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background-color: #f53b57;
  transition: 0.3s;
}

/* 当滑动选择器上的滑动按钮滑动时 */
input[type="range"]:active::-webkit-slider-thumb {
  background-color: #ef5777;
  box-shadow: 0 0 0 6px rgba(155, 73, 146, 0.4);
}

/* 显示数值的容器 */
.selected {
  margin-right: 16px;
  background-color: #f53b57;
  width: 80px;
  line-height: 40px;
  text-align: center;
  color: white;
  border-radius: 4px;
  position: relative;
}

/* 三角 */
.selected::after {
  content: "";
  display: block;
  border-top: 8px solid transparent;
  border-left: 8px solid #f53b57;
  border-bottom: 8px solid transparent;
  position: absolute;
  top: calc(50% - 8px);
  right: -6px;
}
